Nope.
They're boring as central characters. It's how they're built.
For instance:
You can't have a 4 issue limited series with Black Bolt as the central character.
You HAVE to make him a periphery character. He can't speak. But you CAN use him as that character that shows up and wrecks shyt when shyt hits the fan.
Or Medusa. I wonder what her power is? Is it turning folks to stone? hmmm.. It's not? oh.
There's a dude who looks like a fish. I wonder what his power is? Oh shyt he's what people think Aquaman is, minus the actual talking to fish!
Gorgon? Who cares? I mean... look at him. Oh shyt! He can make shockwaves in the ground when he stomps his feet? Who cares? they barely showed his power when he could USE his power. he's big angry strong guy with horse legs. A watered down hercules. yaay.
PLUS you have all of this history and political intrigue tied to them. Nobody cares about that shyt.
The only inhumans that can make it on their own are
Crystal
Karnak
Maximus (as a villain)
let's make NEW inhumans!
Marvel can barely make new anything that sticks unless they media blitz a character
And besides, new inhumans are still inhumans.
Do you think any of us actual fans are wondering why Marvel isn't pushing Kamala Khan as "the new INHUMAN marvel star"?
Nope, it's because we know they KNOW better.